Magnetic Field Induced Slow Magnetic Relaxation in KEr(MoO4)2
V. Tkáča, A. Orendáčováa, R. Tarasenkoa, D.M. Pajerowskib, E. Čižmára, M. Orendáča, A.G. Andersc, M.W. Meiselb and A. Fehera
aCentre of Low Temperature Physics of P.J. Šafárik University and SAS, Faculty of Science, P.J. Šafárik University, Park Angelinum 9, 041 54 Košice, Slovakia
bDepartment of Physics and the National High Magnetic Field Laboratory, University of Florida, Gainesville, Florida 32611-8440, USA
cB.I. Verkin Institute for Low Temperature Physics and Engineering of NASU, Lenin Av. 47, 611 03 Kharkov, Ukraine
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The spin dynamics of a layered magnetic insulator, KEr(MoO4)2, have been investigated in a magnetic field applied along the easy axis at temperatures where the magnetism is dominated by the occupation of a ground doublet. More specifically, the DC magnetization and AC susceptibility were studied in magnetic fields up to 5 T and at temperatures ranging from 1.8 to 20 K. The temperature dependence of the AC susceptibility suggests a slowing down of magnetic relaxation with increasing magnetic field. The magnetic field dependence of the AC susceptibility, studied at nominally 2 K, indicates the presence of low-field, intermediate-field, and high-field regimes characterized by the interplay of internal and external magnetic fields that give rise to different relaxation processes.

DOI: 10.12693/APhysPolA.127.353
PACS numbers: 71.70.Ch, 75.30.Gw, 75.50.Xx, 75.78.-n